excactly! K&N intake systems are bad for bmws. I had one on my e46 330xi and it showed check engine light for months, and then i decided to buy a conforti cold air intake and as soon as I installed that the service light went away.


But as far as AFe i have replaced my cold air filter once already and when i got the brand new one it was pre-oiled and i installed this brand new one thats all shiny/clean and no engine light..

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